CsI(Tl)-PiN光电二极管微闪烁探测器的响应建模
Modelling the response of a CsI(Tl)-PiN photodiode Microscintillator Detector
AI总结：
本研究结合传感器物理模型与LTspice仿真的电路响应，建立超小型CsI(Tl)-PiN光电二极管放射性探测器的完整响应模型，经实验室源校准验证一致性优于5%，明确了其探测能量范围与灵敏度。
摘要：
针对拟搭载于气象探空仪的超小型化CsI(Tl)-PiN光电二极管放射性探测器，研究将传感器的物理模型与通过LTspice仿真得到的探测器电路响应相结合，建立了完整的仪器响应模型。该模型以伽马射线的入射能量为输入，输出探测器预期产生的脉冲。通过将模拟得到的能量校准结果与实验室放射源的测量结果进行对比，验证了探测器响应。研究发现，测量电路决定了26 keV的最低可探测能量，最高可探测能量约为10 MeV。在0-800 keV范围内，PiN探测器的能量灵敏度为0.29 ± 0.02 mV/keV。在仪器的校准范围内，仿真校准与实验室校准的一致性优于5%。
英文摘要：
The full instrument response of a superminiaturised CsI(Tl)-PiN photodiode radioactivity detector, intended for deployment on a meteorological radiosonde, has been modelled by combining a physics-based model of the sensor with the detector circuit response, obtained via an LTspice simulation. The model uses the incident energy of a gamma ray as an input, and produces the pulse expected from the detector. The detector response was verified by comparing the simulated energy calibration with a laboratory source. The measurement circuit is found to control the minimum detectable energy of 26 keV, and the maximum detectable energy is ~10 MeV. The energy sensitivity of the PiN detector is 0.29 +- 0.02 mV/keV in the 0-800 keV range. The simulation and laboratory calibrations were consistent to better than 5% over the calibration range of the instrument.
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